Sound output fromDJM2000 nxs using traktor pro2 and obs

i have been using my Djm 2000 nxs with traktor for a few years and it has been spot on. I used to stream with Mixlr with no problems. Over the past few months I have tried to stream using obs.   Idea streams fine but when using traktor I have glitches in audio. Ever second or 2 audio cuts out sounding like a stuttering. I have updated my Mac to the latest version, traktor and Djm all running up to date. 

When I use USB rekordbox analysed there is no such stuttering and all is good.  ive tried latency in traktor. Dropping bit rates in obs and pretty much everything but can't stop the stuttering. Also I sometimes get the output in my monitors sounding very metallic and like using the phaser effect.

please do you have any ideas pulse?

thanks